15W50 Full Synthetic High Performance Motor Oil From Mobil 1. Price is for 1 Quart of Mobil 1 15W50 Back by popular demand, Mobil 1 15W-50's high viscosity provides outstanding performance in high-revving, high-temperature conditions. Mobil 1 15W-50 is formulated with SuperSyn, an extra-high viscosity synthetic fluid, plus extra anti-wear additive to provide extra protection for severe service applications such as towing, hauling and racing. Mobil 1 15W-50 is recommended for high performance vehicles including turbocharged and supercharged engines where a thicker oil film is desired.